Drought stress on plants can cause cellular water deficits and influence the physiology of host plants, which alter the performance of insect pests. This study was conducted to determine the effect of drought and aphid (Myzus persicae Sulzer) infestation on three potato (Solanum tuberosum L) genotypes under greenhouse conditions. A factorial experiment involving three potato genotypes, two levels of drought, and two levels of aphid infestation was conducted. The potato genotypes possessed different levels of tolerance to drought and are described as tolerant (Qingshu 9), moderately tolerant (Longshu 3), and sensitive (Atlantic). Sixty-day-old potato plants were infested with aphid nymphs and monitored for 20 d. There was a significant variety × drought × aphid interaction effect on the parameters measured. The genotype Atlantic, which is sensitive to drought, exhibited greater tolerance to aphid infestation under drought or no drought conditions than the other genotypes. This genotype also exhibited poor host acceptance and the aphid survival rate, colonization success, and average daily reproduction were low. Qingshu 9, which is tolerant to drought, was highly susceptible to aphid infestation and exhibited high host acceptance and greater aphid survival rate, colonization success, and average daily reproduction compared to the other genotypes. This study demonstrates that the biochemical and morphological traits that confer drought tolerance in potato do not necessarily confer aphid tolerance.
Bibliographical noteFunding Information:
This article was fully funded by The National Key Research and Development Program of China (2018YFD0200805). We thank Jing-Jiang Zhou of Rothamsted Research, UK, who critically read the manuscript and gave valuable suggestions which contributed to the quality of this article. We are also grateful to Jiang-Ping Bai and Mohammed Mujitaba Dawuda for their contribution to this publication.
Funding: This article was fully funded by The National Key Research and Development Program of China (2018YFD0200805).
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.
- Antioxidant enzyme activities
- Aphid infestation
- Drought stress
- Hydrogen peroxide